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Key Quiz 8.3
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1
Order the parabolas below without graphing from narrowest to widest:
a)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070977682/448198/mhr_fom10_key8_3_q1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>
b)y = 5x2 - 1
c)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070977682/448198/mhr_fom10_key8_3_q1_1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>
d)y = -3x2 + 10
e)y = x2 - 5
A)d, e, a, b, c
B)b, e, a, c, d
C)d, c, b, a, e
D)b, d, e, c, a
2
A skydiver jumps from a plane. Her height above the ground (in feet) can be modeled by the equation h(t) = -16t2 + 1600 , where t is time in seconds. How long will it take her to reach the ground?
A)10 s
B)20 s
C)50 s
D)100 s
3
Which of the following is true of the relation y = -2x2 + 32 ?
I. The relation has zeros at −4 and 4.
II. The relation has a y-intercept of 16.
III. The relation is narrower than the relation y = -x2 + 32 .
A)I only
B)I and II
C)I and III
D)I, II, and III
4
The graph of the quadratic relation y = ax2 + 10 passes through the point (−4, 12). Find the value(s) of a.
A)a = 1/4
B)a = 1/8
C)a = - (1/8)
D)a = - (7/72)
5
The graph of the quadratic relation y = (2/3)x2 + c passes through (6, 20). Find the value(s) of c.
A)c = 44
B)c = 12
C)c = -4
D)c = - (782/3)





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